RFR: 8280482: Window transparency bug on Linux [v2]

[Alexander Zvegintsev]

On Fri, 21 Jul 2023 08:08:21 GMT, Tejesh R <tr at openjdk.org> wrote:

> Also No need to test for full screen I guess, just the top row checking will be fine I guess. 

This area is very dependent from screen arrangement:

![image](https://github.com/openjdk/jdk/assets/77687766/79fe8b04-7cdf-493b-bf2d-2f653d1af134)

![image](https://github.com/openjdk/jdk/assets/77687766/0cc5a552-a437-4a40-bfe8-20dbf8ba43fd)


![image](https://github.com/openjdk/jdk/assets/77687766/994c0ca0-c28f-482d-81e8-f21a9c7e9af7)

![image](https://github.com/openjdk/jdk/assets/77687766/7662602f-1f4e-421f-8cc1-25524049e133)

![image](https://github.com/openjdk/jdk/assets/77687766/86978049-b385-48ee-8058-ab8a9dbb3eb2)
![image](https://github.com/openjdk/jdk/assets/77687766/1255b7ec-2e3b-4a5e-ae36-0ca59462843a)

-------------

PR Review Comment: https://git.openjdk.org/jdk/pull/14825#discussion_r1270473696